I wonted the readers of my website's newsletters to be able not only to read the news, but also to visit actual node page on the site. It would be very easy to include a token when #605212: Tokenize the header and footer is solved. However, I have played little bit with a template of newsletter content type to include the source URLs and encountered problem with double source URLs when used together with Print module, which also can generate PDF-version. So now, if I include source URL in a newsletter templete, then printer or pdf-versions of the pages show double links like:

Permalink:  http://mywebsite.com/story/2011/06/massive-scareware-operation-nabs-two-latvian-twenty-somethings
Source URL: http://mywebsite.com/story/2011/06/massive-scareware-operation-nabs-two-latvian-twenty-somethings

If I don't modify a newsletter template, then there is no way for the newsletter readers to return to the node's page on the website. It would be very nice if Simplenews Template could include Source URL of the node by default just link Print module does.